Informed consent was obtained from 32 randomly selected people. I recorded a tone from my keyboard on a cassette tape with a tape recorder. I blindfolded each test subject, then stood a distance of 10 feet from the subject. I played the tone while standing directly in front, behind, to the left, to the right, and at the midpoints between all these extremes and instructed the subject to point in the direction he thinks the source of the sound is. The distance between where the subject pointed and the actual sound source location was measured and recorded for each location. The accuracy of each individual's binaural hearing was determined and analyzed.
The overall accuracy of binural hearing (average) is 84%. The accuracy in locating the sound sources in each location are as follows: Directly in front -94%; Directly behind - 91%; Directly to the left - 89%; Directly to the right - 85%; Midpoint between front and right - 80%; Midpoint between front and left - 76%; Midpoint between behind and right - 75%; Midpoint between behind and left - 79%.
The data collected disproved my hypothesis that sound sources placed directly to the sides would be more accurately located than those directly in front or behind. The sound sources placed directly in front or behind the subject were more accurately located. All subjects had moderate difficulty locating the sources placed at the midpoints.
This project is to determine the accuracy of binaural hearing.
Science Fair Project done By Paul M. Cooper